The title compound, C(24)H(56)N(4)P(6) or ((i)Pr(2)N)(2)P-P(4)-P(N(i)Pr(2))(2), adopts a butterfly structure, with planar environments for the N atoms and pyramidal environments for the P atoms. The structure studied has a 15% twin component that is related by a twofold rotation about [100]. 
DOI: 10.1107/S1600536808037938

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@inproceedings{apczukKrygier200824Bisbisdiisopropylaminophos, title={2,4-Bis[bis(diisopropyl­amino)­phos­phanyl]-1,2,3,4-tetra­phospha­bicyclo[1.1.0]butane}, author={Agnieszka Łapczuk-Krygier and Katarzyna Anna Baranowska and Jerzy Pikies}, booktitle={Acta crystallographica. Section E, Structure reports online}, year={2008} }